Fastening device for incandescent bodies.



B. STEIL. FASTENING DEVICE FOR INGANDESGENT BODIES. APPLICATION FILEDAPR. 17, 1908.

937,483. Patented 0ct,1'9,1909.

Edmund leil.

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UNITED STATES PATENT OFFICE.

EDMUND STEEL, 0F BERLIN, GERMANY, ASSIGNOR TO BERLIN-ANI-IALTISGHEMASCHIN- EN BAU, ACTIENGESELLSCI-IAFT, 0F BERLIN, GERMANY, A FIRM.

FASTElSTING DEVICE FOR INCANDESCENT BODIES.

Specification of Letters Patent.

Patented Oct. 19, 1909.

Application filed April 17, 1908. Serial No. 427,697.

ject of the King of Prussia, residing at No.

26 YVinterfeld street, city of Berlin, in the Kingdom of Prussia,Germany, have invented new and useful Improvements in Fastening Devicesfor Incandescent Bodies, of which the following is a specification.

This invention relates to means for fixing the incandescent body and itsaccessory, such as a protecting basket, on the burner head or to theframe of a gas lamp for the illumination of railway carriages,inconnection with.

whidch the device is especially intended to be use The object of thisinvention is to provide a connecting device which is positivelyprevented from becomin loose by theunavoidable vibrations in rai waycars or carriages, while its handling is simple and easy, and a readyinterchange of the body assured.

A further object of the invention is to provide a device which iscapable of seizing and clenching the means carrying the basket and theincandescent body placed therein, in a concentric position with respectto the burner, even although the diameter, other dimensions or the shapeof the part to be fastened may vary within certain limits.

These objects are attained by the employment of spring tongues orfingers tangentially touching or embracing the circumference of aring-shaped carrier supporting the incandescent mantle and itsprotecting basket, and also engaging under a lateral projection or aflange of the said carrier with their upper edges, which edges aretapered to the free ends of the tongues, so that, when the tongues aremoved around the carrier, their edges will press the saidcircumferential projection upon a seat thereby immovably clamping themantle support in a position concentric with the burner. The saidtongues being attached to .a rotatable ring, the mantle-supporting meanswill be seized or released by all of them at the same time, thuspermitting an easy and ready handling and the required exactness ofoperation.

The nature, construction, and operation of the fastening device will beseen from the following detail description in connection with theaccompanying drawings forming part thereof and in which Figure 1 is avertical sectional elevation of the principal parts of an incandescentlamp provided with the fastening device embodying my invention, Fig. 2is an inverted plan of the lamp represented in Fig. 1, Fig. 3

is a side elevation of the burner and of the fastening device, Fig. 4 isa horizontal section on the line 4-.4; of Fig. 3, looking in thedirection of the arrows and Fig. 5 represents the gripping tongues andthe ring bearing the same.

A ring 6 having an outwardly dlrected flange 9 or the like on its upperend bears the incandescent mantle 7, angular arms 19 of which rest uponan inwardly directed flange formed on the lower end of the ring 6. Tothis ring is also attached a basketshaped housing 8. surrounding themantle and being the protecting means for the same.

The mixing tube 10 of the well-known Bunsen-burner, which is' shown asbeing elbow-shaped, but may be straight or vertical, is inclosed in aconcentric sleeve 11 connected to the lamp-frame and having a step orseat 18 in its inner periphery against vwhich the flange 9 of the mantlesupporting ring is to be pressed by the tongues 12 whlch may be used inany suitable number, for instance three, as illustrated 111 Fig. 0 byway of example. These tongues are equidistantly formed on a commonsupporting ring 13 rotatably arranged upon the outer circumference ofthe sleeve 11, and they may be stamped or cut from the ring 13 orattached thereto in any convenient manner. Circumferential slots 14 madein the ring 13 of the required length. and screws 15 or pins fixed tothe sleeve 11 and engaging the said slots, allow the ring 13 to berotated upon the sleeve to a limited extent, while a flange 16 of thering 13 serves the purpose of facilitating the operation of the ring,and is used as a handle. The tongues 12 tapering on their upper edges,spring inwardly toward each other in a conveniently curved form, asshown in Fig. 5. Apertures or slots 17 cut in the wall of the sleeve 11on corresponding places give the tongues free way for entering theinterior of the said sleeve when the ring 13 is turned in the respectivedirection,

while one lateral edge of the slots moves the tongues outward with therotation of the ring 13 in the opposite direction, so that they willcome to rest on the periphery of the sleeve 11, leaving the interior ofthe latter free or open throughout represented in Fig. 4E). Theinsertion or removal of the mantle-carrier is thus facilitated.

The device is operated as follows: lVhen the fastening tongues 12 are intheir inoperative position described above and illustrated in Fig. t,the mantle-supporting ring 6 can be introduced into the sleeve 11 frombelow and moved upward until its flange 9 rests against the seat 18.Looking of the mantle-carrier 6 is then effected by rotating the ring 13in the direction in which the free ends of the tongues point, wherebythe latter pass through the corresponding slots 17 all at a time,embracing the carrier on all sides by touching its circumference withtheir flat inner sides, thus centering it with respect to the burner.However, since the tongues also engage under the flange 9, their upperinclined edges will clamp it between themselves and the seat 18, thisattachment being maintained immovable by the friction and thespring-action of the tongues. v

The spring tongues being capable of projecting toward the center of thedevice to a greater or less extent, a sure and reliable fastening of thecarrier is attained, even if its diameter varies within certain bounds.Moreover, as the long edges of the tongues engage under the flange, anda long line of supporting contact being afforded, the flange need notnecessarily be continuous, but may be provided with recesses, as may berequired for any other purpose, without interfering with a satisfactoryattachment. Therefore, most of the constructions of mantle-supports nowin use, can be aflixed to any lamp by means of this device.

I have disclosed a constructional form of the fastening device in theaccompanying drawings for the purpose of example, but evidently thedetails of the appliance may be varied in different ways, withoutdeparting from the principle of my invention; the movement of the ringcarrying the tongues, upon the sleeve, may be guided and limited byother equivalent means. I, therefore, do not wish to be limited to theillustrated construction, but

What I broadly claim as my invention, and desire to secure by LettersPatent, is

1. In a lamp, the combination of a mantle holder provided with aprojection, a ring revoluble in relation to said mantle holder, saidring being provided with a plurality of spring tongues projectinginwardly therefrom and adapted to engage said mantle holdertangentially, said spring tongues being so located relatively to saidprojection as to engage the same, and means for supporting said mantleholder.

2. In a lamp, the combination of a mantle holder provided with aprojection extending laterally therefrom, a seat disposed adjacent tosaid mantle holder, and a revoluble ring, said ring being provided witha plurality of inwardly extending spring tongues for the purpose ofengaging said mantle holder, said projection extending laterally fromthe latter, and said tongues being tapered for the purpose of pressingsaid projection firmly upon said seat.

3. In a lamp, the combination of a mantle holder, a seat for said mantleholder, said seat being formed upon the lamp, and a revoluble ring, saidring being provided with a plurality of spring tongues projectinginwardly from it and tangentially engaging said mantle holder, saidspring tongues being tapered for the purpose of pressing said mantleholder upon said seat.

4:. The combination of a mantle carrier provided with a projectionextending outward from the circumference thereof, a vertically disposedsleeve having a seat formed in it, said sleeve being disposed adjacentto said mantle holder and being provided with a plurality ofperforations, a ring revoluble relatively to said sleeve, and aplurality of spring tongues projecting inwardly from said ring andextending through said perforations of said sleeve so as to tangentiallyembrace said mantle carrier and at the same time to engage said lateralprojection upon the latter.

5. In a lamp, the combination of a mantle holder provided with aprojection extending outwardly from its circumference, a verticallydisposed sleeve mounted fixedly in position and provided with a seat andalso with a plurality of perforations, a ring revoluble relatively tosaid sleeve, a plurality of spring tongues projecting inwardly from saidring through said perforations of said sleeve for the purpose ofembracing tangentially said mantle holder and also engaging saidprojection extending laterally from the same, and means for limiting therotation of said ring relatively to said sleeve.

6. In a lamp, the combination of a mantle holder having upon its outercircumference a projection extending laterally therefrom, a burner, asleeve encircling said burner and concentric thereto, said sleeve beingprovided with openings, a ring revoluble relatively to said spring andprovided with a plurality of curved spring tongues projectingtangentially from said ring and extending through said openings, saidtongues embracing said mantle holder tangentially and engaging saidprojection upon the under side thereof, the upper edges of said tonguesbeing tapered, and means for guiding said ring relatively to saidsleeve.

7 In a device for fastening incandescent mantles to burners, thecombination with a burner having a tubular portion to receive a mantlecarrier, said tubular portion being provided with a plurality ofopenings, of a ring rotatable on the tubular portion and provided withspring tongues adapted to project through the said openings to lock 10the mantle carrier in position.

In testimony whereof I have set my signature to this specification inthe presence of two subscribing witnesses.

EDMUND STEIL. Witnesses:

WOLDEMAR HAUIT, HENRY HASPER.

